Scientists in Germany have found a way to dramatically reverse the molecular age of human cells, transforming blood cells from an 80-year-old person into stem cells with an age signature of less than 20 years. Researchers at the University Hospital of Bonn and the University of Bonn achieved this remarkable transformation by reprogramming immature red blood cells into neural stem cells, which can eventually develop into brain cells. During the process, molecular markers associated with aging were effectively reset, making the cells more than 60 years younger at the molecular level.
Unlike earlier approaches, the rejuvenation happened gradually, allowing scientists to follow the changes over an extended period. This slower process could provide important clues about how cellular aging can be reversed and potentially help researchers investigate treatments for diseases associated with aging. The findings were published in the journal Aging Cell.
How Scientists Turn Blood Cells Into Brain Stem Cells The human body contains hundreds of specialized cell types, all of which originate from a single fertilized egg and carry essentially the same genetic instructions. As cells develop, however, they take on specific roles. Under normal circumstances, a skin cell cannot transform into a liver cell, and a blood cell cannot become a nerve cell.
Modern laboratory techniques have made it possible to overcome these biological restrictions. Scientists can now reprogram certain mature cells to adopt entirely different identities. For example, skin cells can be converted into cells capable of producing nerve tissue, an approach that could eventually contribute to treatments for neurodegenerative diseases.
The process relies on a combination of proteins called transcription factors, which regulate how genes are activated. By changing which genetic instructions a cell follows, these proteins can redirect its development and give it a new cellular identity. "Using this method, we have directly converted red blood cell precursors into neural stem cells," explains Prof.
Oliver Brüstle, director of the Institute of Reconstructive Neurobiology at the University Hospital of Bonn. Earlier experiments by the Bonn team had already demonstrated that nerve cells generated through this approach could successfully connect with existing neurons after being transplanted into the brains of mice. Scientists Reverse More Than 60 Years of Cellular Aging The latest investigation focused on an especially intriguing consequence of cellular reprogramming: the dramatic reversal of molecular aging.
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